KR101668435B1 - Monitoring apparatus for solar power generation system - Google Patents

Abstract

Provides a solar power system monitoring device. The solar power generation system monitoring apparatus includes: a current sensor unit installed for each cable that is connected to the inverter from the solar power plant connection panel; A communication unit for collecting and transmitting current data measured by the current sensor unit; And a monitoring unit for classifying the data according to the connection module input for each inverter by the current data and for comparing the connection semi-current data for each inverter to determine whether or not at least one of the solar cell array, the connection module, and the inverter is abnormal .

Description

TECHNICAL FIELD [0001] The present invention relates to a monitoring system for a solar power generation system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar power system monitoring apparatus, and more particularly, to a solar power system monitoring apparatus applicable to a solar power supply section leading to a solar cell array, a connection panel, and an inverter.

A variety of monitoring systems are currently in operation to operate and maintain large-scale solar power plants. Solar power plant monitoring system is expected to generate stable profit through efficient operation such as integrated control of solar cell arrays and connection panels that are scattered, stable power system linkage through forecasting of power generation amount, and remote control of power generation facilities.

The monitoring system of the existing solar power plant uses the inaccurate method of estimating the power generation amount by using the meteorological information of the meteorological office and installs a communication device in each of the scattered solar cell arrays and connection panels, You are connected or using a wireless network.

The monitoring device is configured in such a way as to be able to identify general power generation aggregation and fault detection of the inverter rather than scientific monitoring and maintenance by utilizing the monitoring system provided by the inverter company.

It is more time consuming to deal with troubles due to the failure of the communication device than the inherent maintenance of the power plant by utilizing the method of installing and monitoring the communication device in the connection unit or the solar cell array structure unit.

This is an additional problem that unlike the operation of the power plant that should be operated in the long term, it leads to an increase in the incidental expenses such as the communication cable replacement due to the deterioration and deterioration of the communication cable between the connection and the electric room and the communication cost.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to continuously monitor the abnormality of the whole photovoltaic generation system by integrally collecting and managing the power parameters for each inverter room by installing current sensors in the inverter- The present invention provides an apparatus for monitoring a photovoltaic power generation system.

It is also an object of the present invention to provide a monitoring system for a photovoltaic power generation system capable of monitoring power supply efficiency for each of connection units connected to an inverter.

It is another object of the present invention to provide a monitoring system for a photovoltaic generation system capable of discriminating an abnormality in a solar cell array, a connection panel, and an inverter when an abnormality occurs.

According to an aspect of the present invention, there is provided a solar battery module including: a current sensor unit installed for each cable leading from a solar power plant connection panel to an inverter; A communication unit for collecting and transmitting current data measured by the current sensor unit; And a monitoring unit for classifying the data according to the connection module input for each inverter by the current data and comparing the connection semi-current data for each inverter to determine whether or not at least one of the solar cell array, the connection module, and the inverter is abnormal Provides a solar power system monitoring device.

The monitoring unit may determine that an abnormality has occurred in the solar cell array connected to the connection module when the current data of the connection module connected to the specific inverter is out of the preset ratio range as compared with the current data of the other connection module.

The monitoring unit may determine that an abnormality has occurred in the connection module when the current data of the connection module connected to the specific inverter is out of the preset ratio range.

The monitoring unit may determine that an abnormality has occurred in the inverter when the current data of the connection unit connected to the specific inverter is out of the preset ratio range.

The current sensor unit may include at least one of a current transformer and a Hall sensor.

The monitoring unit may further include a display device for displaying data classified according to a connection module input for each inverter.

The monitoring system of the photovoltaic generation system according to the present invention can continuously monitor the abnormality of the whole photovoltaic power generation system by integrating and managing the power parameters for each inverter room by installing a current sensor in the installed inverter input cable, The present invention provides a solar power system monitoring apparatus capable of monitoring the efficiency of power supply to each of connection units connected to an inverter, and it is possible to determine which part of the solar cell array, the connection panel, .

1 is a schematic diagram of a solar power generation system according to an embodiment of the present invention,
2 is a configuration diagram of a solar photovoltaic system monitoring apparatus according to an embodiment of the present invention;
FIG. 3 is a view for explaining the operation of the monitoring system for the photovoltaic generation system according to the embodiment of the present invention.

The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated and described in the drawings. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms including ordinal, such as second, first, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the second component may be referred to as a first component, and similarly, the first component may also be referred to as a second component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and redundant description thereof will be omitted.

1 is a schematic diagram of a solar power generation system according to an embodiment of the present invention.

Referring to FIG. 1, a photovoltaic power generation system according to an embodiment of the present invention may include a solar cell array, a connection panel, an inverter, and a photovoltaic system monitoring device.

First, the solar cell array 100 includes a plurality of solar cell modules arranged in an array, and outputs a direct current to the connection module 200. The solar cell array 100 includes a plurality of solar cell modules connected in series in a manner of converting solar energy into electrical energy and outputting the solar cells, and a plurality of solar cell arrays may be connected to one connection panel.

A plurality of solar cell arrays 100 may be connected to the connection board 200 in parallel. The connection unit 200 can connect the solar cell array 100 and the inverter 200 to connect the direct current power generated from the solar cell array 100 in series or in parallel and prevent the fuse and the reverse current A diode can be installed. A plurality of connection modules can be connected to one inverter.

The inverter 300 can convert the generated power provided in the form of a direct current in the connection module 200 into alternating current and supply it to the lower stage (not shown). The inverter 300 is installed in the electric room, and each inverter 300 is connected to a plurality of the connection units 200 through a cable so as to be supplied with DC power.

2 is a configuration diagram of a solar photovoltaic system monitoring apparatus according to an embodiment of the present invention.

2, the apparatus for monitoring a photovoltaic generation system according to an exemplary embodiment of the present invention includes a current sensor 310 installed in a cable 301 that is connected to an inverter 300, And a monitoring unit 400 receiving the current data from the communication unit 320 and the communication unit 320 to monitor the solar power generation system.

First, the current sensor unit 310 may be installed for each of the cables 301 that are connected to the inverter 300 from the solar power plant connection unit. The current sensor unit 310 may be, for example, a ring-shaped current transformer installed in each of the cables 301 that are drawn into the inverter 300. The current sensor unit 310 may measure the current for each cable 301 that is input to the inverter 300 and transmit the current data to the communication unit 320. On the other hand, currents can be measured by providing the Hall elements or the fuse elements in each of the cables 301 that are drawn into the inverter 300.

The communication unit 320 may collect current data measured by the current sensor unit 310 and transmit the collected current data. The communication unit 320 includes a current sensor unit 310 installed in a cable 301 connecting the inverter 300 to the connection unit 200 which can be installed inside the housing accommodating the inverter 300, And transmits the collected current data to the monitoring unit 400.

The monitoring unit 400 classifies data according to the connection unit 200 that is received for each inverter 300 from the current data received from the communication unit 320 and compares the connection half current data of each inverter to obtain a solar cell array, It is possible to judge whether or not at least one of the inverter and the inverter is abnormal.

The monitoring unit 400 may further include a display device for displaying data classified according to the connection module that is input for each inverter 300. [

The monitoring unit 400 may be installed in an electric room accommodating a plurality of inverters, or may be implemented in a management room, a control room, or the like outside the electric room. That is, the monitoring unit 400 receives the current data from the plurality of inverters or the electric room and can use it to determine whether the entire solar power generation system is abnormal or not, Can be displayed.

The monitoring unit 400 can determine whether any one of the solar cell array, the connection panel, and the inverter is abnormal by using the current data received from the communication unit.

The monitoring unit 400 may determine that an abnormality has occurred in the solar cell array connected to the connection module when the current data of the connection module connected to the specific inverter is out of the preset ratio range as compared with the current data of the other connection module. That is, the monitoring unit 400 divides the current data measured in a plurality of cables that are input to a specific inverter into connection classes, and when the current data of the specific connection group is compared with the current data of the other connection groups, It can be determined that an abnormality has occurred in the solar cell array connected to the connection module. The ratio range for judging the abnormality can be changed by the setting. In consideration of the fact that the current data of the connection module supplied to the same inverter appears uniformly within a predetermined error range, it is set at a ratio of, for example, 5 to 15% . However, this ratio range can be determined by taking into consideration the environment surrounding the solar cell array and the frequency of climate change.

In addition, when the current data of the connection module connected to the specific inverter is out of the preset ratio range, the monitoring module 400 can determine that an error has occurred in the connection module. That is, when the current data of the connection module 400 is greatly deviated from the absolute value, the monitoring module 400 can determine that an abnormality has occurred in the connection module without comparing with the current data of the other connection module. When an abnormality occurs in the connection module, the current data of the entire solar cell array connected to the connection module appears to be out of the normal numerical value. Therefore, it is possible to determine the abnormality using the current data of the connection module without mutual comparison. The monitoring unit 400 may determine that an abnormality has occurred in the connection module when the current value is out of the 90% range, for example, in comparison with the current value at the normal operation, and the ratio range may be changed by setting.

If the current data of the connection modules connected to the specific inverter are all out of the preset ratio range, the monitoring unit 400 may determine that an error has occurred in the corresponding inverter. That is, when all the current data of the plurality of connection modules connected to the individual inverters deviate from the normal values, the monitoring section 400 can determine that an error has occurred in the corresponding inverters.

3 is a diagram for explaining the operation of the monitoring unit according to an embodiment of the present invention.

Referring to FIG. 3, five inverters A to D are connected to inverters A to D, respectively, and power data calculated by using current data and current data for each of the inverters A to D is displayed.

The monitoring unit judges that an abnormality has occurred in the solar cell array connected to the connection panel 1 when the current data of the connection panel 1 connected to the inverter A is out of the range of the predetermined ratio 10% as compared with the current data of the connection panels 2 to 5 do.

Also, if the current data of the connection module 3 connected to the inverter B is 0, the monitoring part judges that an abnormality has occurred in the connection module when it is out of the set ratio range.

In addition, when the current data of all the connection modules connected to the inverter C exceed the preset ratio range, the monitoring section determines that an error has occurred in the inverter.

As used in this embodiment, the term " portion " refers to a hardware component such as software or an FPGA (field-programmable gate array) or ASIC, and 'part' performs certain roles. However, 'part' is not meant to be limited to software or hardware. &Quot; to " may be configured to reside on an addressable storage medium and may be configured to play one or more processors. Thus, by way of example, 'parts' may refer to components such as software components, object-oriented software components, class components and task components, and processes, functions, , Subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functions provided in the components and components may be further combined with a smaller number of components and components or further components and components. In addition, the components and components may be implemented to play back one or more CPUs in a device or a secure multimedia card.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

100: solar cell array
200: Connection board
300: Inverter
310: current sensor unit
320:
400: Monitoring section

Claims (6)

A current sensor unit provided for each cable that is introduced into the inverter from the PV plant connection panel;
A communication unit for collecting and transmitting current data measured by the current sensor unit; And
And a monitoring unit for classifying the current data according to the connection module input for each inverter and for comparing the connection semi-current data for each inverter to determine whether there is an abnormality in the solar cell array, the connection module and the inverter,
The monitoring unit,
When the current data of the connection module connected to the specific inverter is out of the range of 5 to 15% in comparison with the current data of the other connection module, it is judged that an abnormality occurs in the specific solar cell array connected to the connection module,
If one of the current data of the connection module connected to the specific inverter is compared with the current value in the normal operation state and it is out of the 90% ratio range,
When comparing each current data of a connection module connected to a specific inverter with the current value in a normal operation state and judging that an error occurs in the inverter when all the current data are out of the 90% System monitoring device.
delete delete delete The method according to claim 1,
Wherein the current sensor unit comprises at least one of a current transformer and a hall sensor.
The method according to claim 1,
Wherein the monitoring unit further comprises a display device for displaying data classified according to a connection group inputted for each inverter.

Images